ACTIVE COIL-CORE SYSTEM AS A PART OF RIGID BODY SUPPORT AND ITS INFLUENCE ON THE BODY VIBRATIONS

Abstract

In the paper we took into account the influence of the actively controlled coil dampers introduced into vibrating body supports. The body was considered as moving mass centre of 3-degrees-of-freedom. Investigated object was located on four supports. Body dynamics was described by means of Newton and Euler equations. Body vibra­tions were caused by statically unbalanced rotor located inside the object. In the control system the coils with the movable cores were used as the executive elements (controllable stiffness). In the closed-loop system the PD regu­lators were introduced into each support. The coils current was controlled by means of pulse width modulated (PWM) generators. In the article we presented the time characteristics and the frequency responses of the investi­gated system. Differences between open (non-controlled) and closed-loop (actively controlled) system were shown. Responses to the rotor perturbations were also calculated. Finally, the main advantages and disadvantages of the proposed solution were discussed. The further work directions were also indicated.